166186994 has 16 divisors (see below), whose sum is σ = 258903000. Its totient is φ = 79908864.

The previous prime is 166186991. The next prime is 166187027. The reversal of 166186994 is 499681661.

166186994 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 162435025 + 3751969 = 12745^2 + 1937^2 .

It is not an unprimeable number, because it can be changed into a prime (166186991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9332 + ... + 20480.

Almost surely, 2^166186994 is an apocalyptic number.

166186994 is a deficient number, since it is larger than the sum of its proper divisors (92716006).

166186994 is a wasteful number, since it uses less digits than its factorization.

166186994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11437.

The product of its digits is 559872, while the sum is 50.

The square root of 166186994 is about 12891.3534588111. The cubic root of 166186994 is about 549.7927527703.

The spelling of 166186994 in words is "one hundred sixty-six million, one hundred eighty-six thousand, nine hundred ninety-four".